as in wiseacres
informal + disapproving
a person who talks and behaves like someone who knows everything
My neighbor is a real know-it-all, always telling me what to do.
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Recent Examples of know-it-alls
Ignore imposter syndrome and the opinions of know-it-alls.
—
Usa Today, USA Today, 11 Oct. 2025
Usa Today, USA Today, 11 Oct. 2025
Recent Examples of Synonyms for know-it-alls
wise guys
Noun
-
The Green Bay Packers made quite a Week 1 impression — at least with the wise guys in Las Vegas.—
Rob Reischel,
Forbes.com,
9 Sep. 2025
Cite this Entry
“Know-it-alls.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/know-it-alls. Accessed 18 Oct. 2025.
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